Hearthstone’s Whispers of the Old Gods expansion is here with the chance for you to pick up 134 new cards, with 20 new legendaries. And, on top of that, every player gets a C’Thun legendary just by opening their first WotOG pack. But what should you do next?

First up, open every pack you’ve bought, any you’ve purchased with cash (or gold), and the three bonus packs you get from just logging in… though I expect most of you have done that already. After that, it’s time to tweak your decks — most of which are likely considered “wild” decks, meaning they include cards from Goblins vs. Gnomes and Curse of Naxxramas — so you can complete quests to win yet more Whispers of the Old Gods cards.

First, you’ll be asked to win two games in standard mode, then you’ll be asked to win an additional seven. Doing both quests will net you another ten packs. Rip ‘em open for yet more cards.

Once you’ve taken inventory of your winnings, it’s time to figure out just which legendaries to craft to complete your card collection — and build decks that will make your opponents cringe. While the value of each card on this list depends greatly on the type of deck you put them in — Vek'lor, below, would be terrible in a deck without C'Thun — everything here could be the key to a killer Hearthstone deck. So let’s take a look at the 10 best new legendary cards to see which ones are worth the 1600 dust you’ll need to craft each.

Vek’lor comes in at the very top of our to-craft list because of his amazing synergy with WotOG staple C’Thun. For seven mana you get a 4/6 with taunt and if your C’Thun is buffed you’ll get a second 4/6 with taunt — a fantastic deal for the mana you're spending. Hold him back until C’Thun reaches 10 attack and you’ll solid board control out of this play.

The only reason not to craft Vek’lor? If you’re not playing a C’Thun deck, and if you aren’t then you really aren’t getting into the Old Gods spirit.

Dragon priest is go, I repeat, dragon priest is go! Okay, you don’t have to play a dragon priest to make best use of Deathwing, Dragonlord — any dragon-heavy deck will do. He’s a powerful 12/12 to start with and if your opponent wants to take him out before being crushed under the weight of that damage, you could wind up with a real dragon army. If you're putting this Deathwing variant into play, hold on to any dragons in your hand to maximize his impact.

He’s a good fit for a dragon deck — but if you don’t have the cards (or the interest) for such a deck, this card is skippable.

Druids have a number of cards with two effects you have to choose between when you cast them — but with Fandral, you won’t have to choose anymore. It's an easy way to add big power to your druid deck, making Fandral a real must-have. Just check him out in action above.

For just five mana, Hallazeal could very well turn the tide of the game. It's a good buy for anyone running a shaman deck — just pack in the powerful spells like Lightning Storm, Lava Burst, and plenty of others from the shaman arsenal. Since Hallazeal is going to be a major target for your opponent, hold off on playing him until you’re down on health and can immediately follow-up with a strong spell. If you can keep him up for a few turns, your opponent is going to have a very bad day.

Xaril comes in at a reasonable four mana, and while this card isn't powerful in and of itself, it will give you a buff card both when you play it and when it’s killed. Each toxin card Xaril creates costs a single mana, making them great for generating combos. On top of that, their effects (draw a card, return a minion to your hand, give a minion +3 attack, deal two damage) are good on their own. Any rogue deck could make use of this.

Pack in the deathrattles and N’Zoth is another card that could win the game for you — the downside being its ten mana cost, meaning you can’t play him until you’re already at your end-game. But depending on the cards N’Zoth draws — if you've played more deathrattle minions than you have room for on the board, N'Zoth will pick randomly — he could secure a victory or give you a chance to make a comeback.

We shouldn't be surprised that Whispers of the Old Gods cards seem to have an obsession with death(rattle). This is another one that would slot neatly into a deathrattle-focused deck, causing any deathrattles to trigger twice. (Pair Huhuran with N'Zoth for twice the deathrattle action.) Even on its own, Huhuran's five mana cost for 6/5 beast is a strong addition to the board.

Volazj shares some similarities to Huhuran in that it can be put into a deathrattle deck to trigger deathrattles twice. However, Volazj is a bit more flexible, immediately creating a 1/1 copy of any card you have on the board. For cards with inspires, deathrattles, or other effects, Volazj will essentially double their power. Just be sure you have the right minions on the board before you put Volazj in play.

Ragnaros, Lightlord gives you an 8/8 for eight mana — a solid investment on its own, but the card tops that off with a strong heal effect. With a +8 heal at the end of every turn, the Lightlord will keep you and your minions going until your opponent can take him down. While I’ve yet to see any decks that pair the healing of Ragnaros, Lightlord with the damage of Ragnaros the Firelord, building one is totally on my to-do list.

"Hope's End" is right. Gamblers, this is the card for you. While I’m not convinced Yogg-Saron is a good card, it’s certainly an interesting one. Any deck that delves heavily into spells will make the most of Yogg, with every spell cast making Yogg cast a new random spell on a random target. It will either win the game or lose the game. Check out the video above to see how casting Yogg can go very right... or very wrong.